CN102854420B - System for evaluating comprehensive state indexes of transformer - Google Patents

Abstract

The invention provides a system for evaluating comprehensive state indexes of a transformer. The system comprises a storage module for storing weight of each preset evaluation index, an index value range taking part in calculation, comprehensive states of the transformer and a reference value range of the evaluation indexes corresponding to the comprehensive states, a detection module for detecting the evaluation indexes of the transformer, a processing module for obtaining calculation values of the evaluation indexes according to a preset evaluation algorithm, and an evaluation module for judging if the calculation values belong to the index value range taking part in calculation, and if so, determining a current comprehensive state of the transformer according to the reference value range of the calculation values. According to the system provided by the invention, state parameters of the transformer can be comprehensively evaluated.

Description

A kind of transformer state overall target evaluating system

[technical field]

The present invention relates to electric power network technique field, the transformer state overall target evaluating system especially in electrical network.

[background technology]

In the life cycle management process of transformer, in electrical network, the focus of staff to transformer of different department is different, treasurer's department mainly pays close attention to purchasing price, the depreciation and maintenance cost etc. of transformer, traffic department mainly pays close attention to the service data of transformer as voltage, electric current, load etc., and operating maintenance department pays close attention to the running status of transformer as defect situation, test situation, tour situation etc.Each department is different according to focus, all arranges corresponding index system, assesses equipment, all unilaterally reflect certain state of transformer.

Also do not have at present a kind of method to carry out multi objective to transformer state to collect and comprehensively to assess afterwards, and provide the integrated operation situation of transformer.

[summary of the invention]

The present invention proposes a kind of transformer state overall target evaluating system, carries out comprehensive assessment, and provide the comprehensive state of transformer to transformer each side index.

The overall target evaluating system of transformer state of the present invention, comprising:

Memory module, for storing the weight of each evaluation index pre-set, participating in the reference range of each evaluation index corresponding to the desired value scope of calculating, each comprehensive state of described transformer and described comprehensive state;

Detection module, for detecting each evaluation index of described transformer;

Processing module, for obtaining the calculated value of each described evaluation index according to predetermined assessment algorithm;

Evaluation module, for judging whether described calculated value belongs to the described desired value scope participating in calculating, if belonged to, then determines according to the reference range at described calculated value place the comprehensive state that described transformer is current.

As an embodiment, described memory module is also for storing the key index arranged according to preset rules;

Described evaluation module, also for when described evaluation index is described key index, judges, when described calculated value does not belong to the desired value scope of described participation calculating, to be determined by described transformer state according to worst state.

As an embodiment, predetermined assessment algorithm is:

$v=\underset{j=1}{\overset{n}{\mathrm{\Σ}}}(i_j*w_j/\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{w}_k)$

Wherein, v is the calculated value of described evaluation index, and n is the number of described evaluation index, i _jfor a jth evaluation index, w _jfor the weight of a jth evaluation index.

As an embodiment, the preset rules arranging key index is: when the weight of described evaluation index is greater than setting value, then this evaluation index is key index.

As an embodiment, the weight of each evaluation index is normalized calculating by described processing module:

$w_j=w_j/\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{w}_k$

Wherein, the w on the right of equation _jfor the weight of a jth evaluation index, the w on the equation left side _jfor the weight of the evaluation index of the jth after normalization, n is the number of described evaluation index, w _krepresent the weight sum of all evaluation indexes.

Pass through the present invention, reasonable analysis can be carried out to every evaluation index of transformer, and the comprehensive state of transformer can be known, thus the rational basis for estimation of transformer current state can be provided, simultaneously, owing to not requiring in the present invention that set weight summation is the requirement of 1, therefore, it is possible to do not affect the weight setting of existing evaluation index when the evaluation index quantity making participation calculate changes.

[accompanying drawing explanation]

Fig. 1 is the logic diagram of the overall target evaluating system of transformer state.

[embodiment]

The overall target evaluating system of transformer state provided by the invention, Fig. 1 is the logic diagram of the overall target evaluating system of transformer state of the present invention, comprising: memory module, detection module, processing module and evaluation module, and principle of work is as described below:

Suppose that the present invention expects that the index of the transformer assessed comprises n evaluation index of transformer various aspects, be designated as i respectively ₁, i ₂..., i _n; To each evaluation index, pre-set following parameter for each evaluation index:

(1) arrange the weight that it participates in calculating, each weighted value is designated as w respectively ₁, w ₂..., w _n, as an embodiment, weighted value can be arranged between 1 ~ 100, as a preferred embodiment, can also arrange key index according to pre-conditioned, and such as, if weighted value is greater than a certain setting value, then this index is decided to be key index;

(2) to each evaluation index, arrange the desired value scope that it participates in calculating, this desired value scope can be define according to the judgment rule of index, different with different determination methods, is designated as l respectively ₁, l ₂..., l _n;

(3) reference range of i comprehensive state of transformer and each evaluation index corresponding to described comprehensive state is set; Comprehensive state title is designated as s respectively ₁, s ₂..., s _i;

First above each evaluation index is prestored by memory module, when needs are by transformer state overall target evaluating system assessment transformer state of the present invention, each evaluation index of the transformer detected is obtained the calculated value of each described evaluation index according to predetermined assessment algorithm by processing module; Evaluation module judges whether described calculated value belongs to the described desired value scope participating in calculating, if belonged to, then determines according to the reference range at described calculated value place the comprehensive state that described transformer is current.

As an embodiment, the predetermined assessment algorithm in processing module is:

$v={\mathrm{\Σ}}_{j=1}^n(i_j*w_j/{\mathrm{\Σ}}_{k=1}^n{w}_k)$ (formula 1)

Wherein, v is the calculated value of described evaluation index, and n is the number of described evaluation index, i _jfor a jth evaluation index, w _jfor the weight of a jth evaluation index.

As a preferred embodiment, processing module can be normalized calculating to the weight of each evaluation index in formula 1:

$w_j=w_j/\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{w}_k$

If described calculated value belongs to the described desired value scope participating in calculating, then evaluation module determines according to the reference range at described calculated value place the comprehensive state (S102) that described transformer is current.

Below list the comprehensive assessment index calculated value v of transformer and the table of comparisons of comprehensive state in an embodiment, as shown in the table;

Reference range	0～v 1	v 1～v 2	…	v i-1～v i
					Transformer state	s 1	s 2	…	s i

It is worthy of note, if certain evaluation index belongs to key index, then evaluation module judges when the calculated value of this evaluation index does not belong to the desired value scope of described participation calculating, according to worst state, described transformer state is determined that (each index calculate value may correspond to a kind of state (table of comparisons of foundation comprehensive assessment index calculated value v and comprehensive state), worst state is exactly get one the poorest in the state corresponding to all indexs, and usual state S becomes better and better along with subscript increase).

Due to the table of comparisons of set comprehensive index calculate result of the present invention and comprehensive state, and by evaluation module set whole key index within the scope of index calculate time (i _j∈ l _j) according to table of comparisons assessment transformer state, time setting transformer state be worst state, gone out irrational transformer state to avoid the key index item of non-constant by other index item weighted mean later evaluation.

Because in the present invention, the weight of each evaluation index is freely arranged according to importance degree, and do not have weight summation be 1 restriction, therefore, it is possible to do not affect the weight setting of existing evaluation index when the evaluation index quantity making participation calculate changes.

Below the evaluation table according to the component assesses index of the transformer of overall target appraisal procedure acquisition of the present invention in an application example:

The parameter preset comprises:

Transformer synthesis condition adjudgement result example is as follows:

The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (4)

1. an overall target evaluating system for transformer state, is characterized in that, comprising:

Memory module, for storing the weight of each evaluation index pre-set, participating in the reference range of the desired value scope calculated, each comprehensive state of described transformer, the key index arranged according to preset rules and each evaluation index corresponding to described comprehensive state;

Detection module, for detecting each evaluation index of described transformer;

Processing module, for obtaining the calculated value of each described evaluation index according to predetermined assessment algorithm;

Evaluation module, for judging whether described calculated value belongs to the described desired value scope participating in calculating, if belonged to, then determines according to the reference range at described calculated value place the comprehensive state that described transformer is current; When described evaluation index is described key index, judge, when described calculated value does not belong to the desired value scope of described participation calculating, described transformer state to be determined according to worst state.

2. the overall target evaluating system of transformer state according to claim 1, is characterized in that, predetermined assessment algorithm is:

$v=\underset{j=1}{\overset{n}{\mathrm{\Σ}}}(i_j*w_j/\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{w}_k)$

Wherein, v is the calculated value of described evaluation index, and n is the number of described evaluation index, i _jfor a jth evaluation index, w _jfor the weight of a jth evaluation index.

3. the overall target evaluating system of transformer state according to claim 1, is characterized in that, the preset rules arranging key index is: when the weight of described evaluation index is greater than setting value, then this evaluation index is key index.

4. the overall target evaluating system of transformer state according to claim 1, is characterized in that, the weight of each evaluation index is normalized calculating by described processing module:

$w_j=w_j/\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{w}_k$

Wherein, the w on the right of equation _jfor the weight of a jth evaluation index, the w on the equation left side _jfor the weight of the evaluation index of the jth after normalization, n is the number of described evaluation index, represent the weight sum of all evaluation indexes.